I love the concept, and the execution so far is brilliant.

So here's my $0.02 worth...

The bricks are too grey.  You have some beautiful powerful colours in the
background, but the bricks look washed out by comparision.  They need some
texture variation, like maybe a small granite texture, overlayed with a
large scaled, slightly turbulent bozo to tint the colours a little
beige/brownish/reddish colour.  Also some greenish moss/mould could add
some more variety to the colouration.

More superfluous details!  Some lamps/torches could look good - not
necessarily turned on, but it also gives the option of a spooky
night-version of the scene.
Some flags or banners hanging from poles jutting out from the walls.
A hot air balloon or some wooden flying contraption like a DaVinci
helicopter or an Ewok hang-glider.
If you're going to have people walking about, what sort of stuff might they
have laying about?  Potplants, junk, posters?

The knot in the distance is HUGE by comparision to the foreground knot, and
far too indistinct - I can barely see it in the high-res version.

Doors/Windows:
Make some simple dummy objects that represent the shapes of your door/window
objects, and #declare an object that's a union of all the dummy objects
placed along your knot spline (call it 'Myholes' e.g.).  In your brick
placing macro, use an #if(inside(Myholes,<vector>)) to test if the centre
of each brick is inside the space taken up by a hole(?).  If the brick is
inside a hole, don't put one there.  You will need to oversive your dummy
objects a little, and make door/window objects that have a thick enough
border to hide the overhanging bricks.  Store the positions of the dummy
objects in an array, and use them to place the detailed door/window
objects.

Just try running a scene that differences out the portals to see what it
does to your render time...

I'd love to see some knots in the middle distance, partially washed out by
the atmosphere.  You could even try making a giant swingbridge to connect
the foreground knot to one of the others.

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